| Wheat seeding is the most important aspects that ensure wheat production,and the seeding operation quality have a significant impact on the output of wheat. This article is based on researching farms and individual farmers,found the previous issues that wheat seeding depth is inconsistent, seeding quality is not high in the Jiang-Huai, Huang-Huai area. Refer to a number of domestic and foreign literature and production practices, it’s found that the key to solve this problem is to control the seeding depth. This study focuses on the inconsistent seeding depth of the area, and developed a planter which is capable of monomer profiling and can precisely control the seeding depth.In view of the key technologies for planters home and abroad, and combined with the supporting power and agronomic requirements, we designed a planter with monomer profiling and capable of seeding depth control. With the use of modeling software Creo2.0, we draw maps and three-dimensional models of each part, and the movement process of them are simulated. Then a prototype is created according to the design drawings and a field experiment is carried out. The main work and conclusions are as follows:1. The working width of the machine is 3.6m, and the planting rows are 18. Its seeding depth ranges from 2cm to 8cm. And mainly includes hitch mechanism, seeding monomer, rack, walking device, seeding rate control device and other components.2. The planter profiling ditching parts are analyzed, and a seeding monomer capable of monomer profiling and seeding depth control is designed. The machine uses a parallel four profiling. Profiling rod length is 450mm, and the pulling angle for profiling ranges from 15° to 45°. It also uses three articulated trolley to avoid the horizontal swing. Parameters designed for the opener are as follows:accumulation point β=55°, disc angle Ψ=16°, ditching width b=20.8mm. And profiling wheels are rubber wheels with 8cm in width,21 cm in diameter. The distance between the axis of the profiling wheel and the opener blade is designed as 60cm.3. The 3D modeling software is used to draw three-dimensional model of all parts of the profiling opener, and these parts are assembled into a virtual prototype. The finite element analysis was carried out on the traction crossbar by using Ansys software, and the maximum stress that the crossbar bracket optimized can suffer is18MPa, and the maximum deformation is 3.7mm, which meets the design requirements. Motion simulation analysis is carried out on the profiling ditching parts, and the results show that the trajectories of the opener is close to the actual terrain.4. The prototype in this design is produced by Shanghai Yuejin Modern Agriculture Co., Ltd, and the field trials are taken in Shanghai Chongming Yuejin farm. The experimental results show that the main factors affecting the stability of the seeding depth control is sowing depth. And the seeding components designed in this paper can achieve monomer profiling. When seeding depth control is not higher than 8cm, the seeding depth pass rate can meet national standards. Under the condition of 0.46m/s,4cm, the seeding depth of 86.7% is qualified, and seeding depth coefficient of variation is 9.2%. The stability of the system is good. |
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